| AQI | Air Pollution Level | Health Implications | Cautionary Statement |
| 0 - 50 | Good | Air quality is considered satisfactory, and air pollution poses little or no risk. | None |
| 51 - 100 | Moderate | Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution. | Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion. |
| 101 - 150 | Unhealthy for Sensitive Groups | Members of sensitive groups may experience health effects. The general public is not likely to be affected. | Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion. |
| 151 - 200 | Unhealthy | Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects. | Active children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion. |
| 201-300 | Very Unhealthy | Health alert: everyone may experience more serious health effects. | Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else, especially children, should limit outdoor exertion. |
| 300 - 500 | Hazardous | Health warnings of emergency conditions. The entire population is more likely to be affected. | Everyone should avoid all outdoor exertion. |